Don't extract the release package file twice.
Don't extract the release package file twice.

This fix speeds up the delta package process.

punker76/Squirrel.Windows,BloomBooks/Squirrel.Windows,BloomBooks/Squirrel.Windows,punker76/Squirrel.Windows,Squirrel/Squirrel.Windows,punker76/Squirrel.Windows,Squirrel/Squirrel.Windows,Squirrel/Squirrel.Windows,BloomBooks/Squirrel.Windows